/*
 *    Copyright 2006-2020 the original author or authors.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
package org.mybatis.generator.internal.rules;

import org.mybatis.generator.api.IntrospectedTable;

/**
 * This class encapsulates all the code generation rules for a table using the
 * conditional model. In this model we do not generate primary key or record
 * with BLOBs classes if the class would only hold one field.
 *
 * @author Jeff Butler
 *
 */
//jackson.song add
public class ConditionalModelRules extends BaseRules {

	/**
	 * Instantiates a new conditional model rules.
	 *
	 * @param introspectedTable the introspected table
	 */
	public ConditionalModelRules(IntrospectedTable introspectedTable) {
		super(introspectedTable);
	}

	/**
	 * We generate a primary key if there is more than one primary key field.
	 *
	 * @return true if the primary key should be generated
	 */
	@Override
	public boolean generatePrimaryKeyClass() {
		return introspectedTable.getPrimaryKeyColumns().size() > 1;
	}

	/**
	 * Generate a base record if there are any base columns, or if there is only one
	 * primary key coulmn (in which case we will not generate a primary key class),
	 * or if there is only one BLOB column (in which case we will not generate a
	 * record with BLOBs class).
	 *
	 * @return true if the class should be generated
	 */
	@Override
	public boolean generateBaseRecordClass() {
		return introspectedTable.hasBaseColumns() || introspectedTable.getPrimaryKeyColumns().size() == 1
				|| blobsAreInBaseRecord();
	}

	/**
	 * Blobs will be in the base record class if there is only one blob column.
	 *
	 * @return true if there are blobs but they are in the base record class
	 */
	private boolean blobsAreInBaseRecord() {
		return introspectedTable.hasBLOBColumns() && !generateRecordWithBLOBsClass();
	}

	/**
	 * We generate a record with BLOBs class if there is more than two BLOB column.
	 * Do not generate a BLOBs class if any other super class would only contain two
	 * field
	 *
	 * @return true if the record with BLOBs class should be generated
	 */
	@Override
	public boolean generateRecordWithBLOBsClass() {
		int otherColumnCount = introspectedTable.getPrimaryKeyColumns().size()
				+ introspectedTable.getBaseColumns().size();

		return otherColumnCount > 0 && introspectedTable.getBLOBColumns().size() > 0;
	}
}
